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摘要:
The faying surfaces of spot welds were assumed to be sharp notch with two slope planes, finite element software ANSYS was used to model two-spot tension-shear spot-welded samples of different nugget diameter, the notch local elasto-plastic stress and stain in the periphery of the nuggets for samples under loading of different amplitude and different mean value were analyzed, and the nonlinear behaviour of the material was also taken into account. Three kinds of local stress-strain life prediction methods were applied to calculate the crack initiation life in terms of the notch local stress and strain result, including Morrow modified Manson-Coffin equation, Smith-Watson-Topper equation, and maximum principal strain equation, and three groups of prediction results were discussed and analyzed separately. Results showed that within low cycle fatigue regime, crack initiation sites of samples of different nugget size differs, Morrow modified Manson-Coffin equation suits better for the crack initiation life prediction of spot welds, while the other two methods having very diversified results.
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来源 :
Chinese Journal of Materials Research
ISSN: 1005-3093
年份: 2007
期: SUPPL.
卷: 21
页码: 284-288